Python attribute error: object does not have 'self' attribute

Question

I have a problem with class inheritance in Python; it may not be related to inheritance, but I have no other idea. I am working with selenium web driver. Here is the code I'm using:

from selenium import webdriver
class UIInterface(object):
    def __init__(self):
        self.driver = webdriver.Ie()
        self.driver.get('URL')

    def parentMethod(self, itemClassName = ''):
        allElements = self.getAllElements()
        return [el for el in allElements if el.get_attribute('type') == 'checkbox']

    def getAllElements(self):
        return self.driver.find_elements_by_tag_name('input')

class InterfaceChild(UIInterface):
    def __init__(self):
        super(InterfaceChild, self).__init__()


    def childMethod(self):
        returnedList = self.parentMethod(itemClassName = 'SomeClassName')
        for item in returnedList:
            print item.get_attribute('innerHTML')

This code gives me an error for the string returnedList = self.parentMethod(itemClassName = 'SomeClassName'); this error description:

(<type 'exceptions.AttributeError'>, AttributeError("'InterfaceChild' object has no attribute 'self'",), <traceback object at 0x000000000418E5C8>)

I thought that this may be due to inheritance, so I tried to put parentMethodand getAllElementsin the class InterfaceChild; same exception. Any idea on this ??

EDIT 1: This is the main method for instantiating classes:

if __name__ == '__main__':
    ieInterface = InterfaceChild()
    ieInterface.childMethod()

This is a complete stack trace:

Traceback (most recent call last):
    File "C:\Program Files\Eclipse\eclipse-jee-helios-win32\eclipse-jee-helios-win32\plugins\org.python.pydev_2.8.2.2013090511\pysrc\pydevd.py", line 1446, in <module>
        debugger.run(setup['file'], None, None)
    File "C:\Program Files\Eclipse\eclipse-jee-helios-win32\eclipse-jee-helios-win32\plugins\org.python.pydev_2.8.2.2013090511\pysrc\pydevd.py", line 1092, in run
        pydev_imports.execfile(file, globals, locals) #execute the script
    File "D:\workspace\testCode.py", line 133, in main
        ieInterface.childMethod()
    File "D:\workspace\testCode.py", line 33, in childMethod
        returnedList = self.parentMethod(itemClassName = 'SomeClassName')
    File "D:\workspace\testCode.py", line 45, in parentMethod
        allElements = self.getAllElements()
    AttributeError: 'InterfaceChild' object has no attribute 'self'

Answer 1

Python 2.7 , Chrome [1], checker, , . . Mac OS X. .

, , . (Windows Python, :).

from selenium import webdriver

class UIInterface(object):
    def __init__(self):
        self.driver = webdriver.Chrome()
        self.driver.get('http://duckduckgo.com')

    def parentMethod(self, itemClassName = ''):
        allElements = self.getAllElements()
        result = [el for el in allElements]
        print('===', result)
        return result

    def getAllElements(self):
        return self.driver.find_elements_by_tag_name('input')

class InterfaceChild(UIInterface):
    def __init__(self):
        super(InterfaceChild, self).__init__()


    def childMethod(self):
        returnedList = self.parentMethod(itemClassName = 'SomeClassName')
        for item in returnedList:
            print item.get_attribute('innerHTML')


if __name__ == '__main__':
    ieInterface = InterfaceChild()
    ieInterface.childMethod()

:

('===', [<selenium.webdriver.remote.webelement.WebElement object at 0x10e145cd0>, <selenium.webdriver.remote.webelement.WebElement object at 0x10e145d10>, <selenium.webdriver.remote.webelement.WebElement object at 0x10e145d50>])

[1] http://chromedriver.storage.googleapis.com/index.html?path=2.9/